Simple answer to your question, no the 2.0 petrol cannot be remapped to give any significant performance improvement. I've asked a couple of experts as I have 2.0 petrol and was told you could get it chipped or mapped to get a few extra bhp but not enough to notice it.

just change the whole tail pipe! double terminals gave me at least 15 bhp.really noticeble in accelerattion and torque. one more tip for you .if you lower your qq of 2 inches you will get accelerattion and pure speed. i did both and i test by my self the before and after: before acceler...0 to 100 9.7 second at the best.max speed 197 kh . after new pipe and two inch lower : accelera... 0 to 100 8.6 second and max speed 216 and building speed.

Not usually, no. Remapping "Works" on turbo cars principally by increasing the maximum boost pressure and refuelling to match that. Obviously a non-turbo car doesn't have boost pressure to raise. Sometimes extra power can be got through remapping if the engine has been deliberately detuned by the manufacturers for environmental, noise or marketing reasons, but usually it's pretty marginal improvement. Just occasionally a car is programmed never to use full throttle or to limit it's revs and those restrictions can be removed by remapping - but those are rare cases.

Since 140bhp is a fairly healthy output for a normally aspirated 2.0 petrol engine in a standard car i'd guess that the Qashqai 2.0 is pretty close to the engine's designed power output & you wouldn't achieve much by remapping. Maybe doing so in conjunction with fitting additional bits-and-pieces might help a bit more, but usually to make any massive different to a NA engine you have to change significant bits (cams, throttle bodies, exhaust manifolds etc) - at which point you are into serious money and may as well go and buy yourself a turbocharged diesel which you CAN remap to good effect - should you wish to.

To be honest, though, if you're that dead-set on a faster Qashqai - you might like to consider a Murano instead (sorry, guys, but it's true). Now.. If Nissan could put that V6 in a Qashqai... whooeee!

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